A7™ Service Manual 046-006272-00 4 - 53
Calibration System Calibration
4.3.5.2 Troubleshoot Electronic Flowmeter Zeroing Failure
In case of zeroing failure, troubleshoot as follows:
1. Disconnect the gas supplies. Bleed the gas inside the machine or adjust the flowmeter for the
pointer of the pressure gauge to return to zero, and then perform zeroing again..
2. If the zeroing is successful, it is concluded that the previous zeroing failure is caused by the
mechanical failure in the three-way valve or faults in the proportional valves. Replace the three-
way valve assembly and proportional valve assemblies.
3. If the zeroing still fails, it is concluded that the cause is the fault in the Sensirion flow sensors or
the EFCS board. Replace Sensirion flow sensor assemblies and EFCS board..
4.3.6 Total Flow Sensor Calibration (factory)
NOTE: Make sure that the N2O supply is connected and its pressure is within
the normal range.
NOTE: Make sure that the machine is under EFCS state.
4.3.6.1 Calibration Procedure
Perform the following steps to calibrate the total flow sensor.
1. Enter the standby mode.
2. Select [Setup] > [Service] > [Calibration] > [Total Flow Sensor] to enter the screen shown below.
Prepare by following the instructed on the screen.
FIGURE 4-69
3. Select [Begin] to enter the screen shown below.
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